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Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range $$|\eta |<2.4$$ |η|<2.4 using 7 and 470 $$\upmu \hbox {b}^{-1}$$ μb-1 of Pb+Pb collisions at $$\sqrt{s_{\text {NN}}}=2.76$$ sNN=2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients $$v_n$$...

This paper presents a direct measurement of the decay width of the top quark using $$t\bar{t}$$ tt¯ events in the lepton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of 8 TeV and corresponds to an integrated luminosity of 20.2 fb$$^{-1}$$ -1 . The decay width of the top quark is measured using a template fit...

A measurement of the mass of the W boson is presented based on proton–proton collision data recorded in 2011 at a centre-of-mass energy of 7 TeV with the ATLAS detector at the LHC, and corresponding to $$4.6~\hbox {fb}^{-1}$$ 4.6fb-1 of integrated luminosity. The selected data sample consists of $$7.8\times 10^6$$ 7.8×106 candidates in the $$W\rightarrow \mu \nu $$ W→μν channel and $$5.9\times...

A search is performed for new phenomena in events having a photon with high transverse momentum and a jet collected in $$36.7~\text {fb}^{-1} $$ 36.7fb-1 of proton–proton collisions at a centre-of-mass energy of $$\sqrt{s}$$ s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The invariant mass distribution of the leading photon and jet is examined to look for the resonant...

Abstract Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton-proton collision data corresponding to an integrated luminosity of 36.1 fb−1 at a centre-of-mass energy of 13 TeV collected in 2015 and 2016 with the ATLAS detector at the Large Hadron Collider. Events are required to have at least one jet...

Abstract The inclusive cross-section for the associated production of a W boson and top quark is measured using data from proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV. The dataset corresponds to an integrated luminosity of 3.2 fb−1, and was collected in 2015 by the ATLAS detector at the Large Hadron Collider at CERN. Events are selected requiring two opposite sign isolated...

Abstract A search for heavy neutral Higgs bosons and Z′ bosons is performed using a data sample corresponding to an integrated luminosity of 36.1 fb−1 from proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV recorded by the ATLAS detector at the LHC during 2015 and 2016. The heavy resonance is assumed to decay to τ+τ− with at least one tau lepton decaying to final states with hadrons...

A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses $$36.1 \; \mathrm {fb}^{-1}$$ 36.1 fb - 1 of proton–proton collision data recorded by the ATLAS experiment at $$\sqrt{s}=13$$ s = 13...

The results of a search for direct pair production of top squarks in events with two opposite-charge leptons (electrons or muons) are reported, using $$36.1~\hbox {fb}^{-1}$$ 36.1 fb - 1 of integrated luminosity from proton–proton collisions at $$\sqrt{s}=13$$ s = 13 TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences...

Abstract A search for pair production of a scalar partner of the top quark in events with four or more jets plus missing transverse momentum is presented. An analysis of 36.1 fb−1 of s = 13 $$ \sqrt{s}=13 $$ TeV proton-proton collisions collected using the ATLAS detector at the LHC yields no significant excess over the expected Standard Model background. To interpret the results a simplified...

Measurements of transverse energy–energy correlations and their associated asymmetries in multi-jet events using the ATLAS detector at the LHC are presented. The data used correspond to $$\sqrt{s} = 8~\hbox {TeV}$$ s = 8 TeV proton–proton collisions with an integrated luminosity of 20.2 $$~\hbox {fb}^{-1}$$ fb - 1 . The results are presented in bins of the scalar sum...

Abstract This paper presents a measurement of the triple-differential cross section for the Drell-Yan process Z/γ* → ℓ+ℓ− where ℓ is an electron or a muon. The measurement is performed for invariant masses of the lepton pairs, mℓℓ, between 46 and 200 GeV using a sample of 20.2 fb−1 of pp collisions data at a centre-of-mass energy of s = 8 $$ \sqrt{s}=8 $$ TeV collected by the ATLAS detector...

Abstract A search for the decay of the Standard Model Higgs boson into a b b ¯ $$ b\overline{b} $$ pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb−1, were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Final...

Abstract A search is presented for particles that decay producing a large jet multiplicity and invisible particles. The event selection applies a veto on the presence of isolated electrons or muons and additional requirements on the number of b-tagged jets and the scalar sum of masses of large-radius jets. Having explored the full ATLAS 2015-2016 dataset of LHC proton-proton collisions at ...

Abstract The electroweak production and subsequent decay of single top quarks in the t-channel is determined by the properties of the Wtb vertex, which can be described by the complex parameters of an effective Lagrangian. An analysis of a triple-differential decay rate in t-channel production is used to simultaneously determine five generalised helicity fractions and phases, as well as the polarisation...

Abstract A search for the supersymmetric partners of the Standard Model bottom and top quarks is presented. The search uses 36.1 fb−1 of pp collision data at s = 13 $$ \sqrt{s}=13 $$ TeV collected by the ATLAS experiment at the Large Hadron Collider. Direct production of pairs of bottom and top squarks ( b ¯ 1 $$ {\overline{b}}_1 $$ and t ¯ 1 $$ {\overline{t}}_1...

Abstract Measurements of differential cross-sections of top-quark pair production in fiducial phase-spaces are presented as a function of top-quark and t t ¯ $$ t\overline{t} $$ system kinematic observables in proton-proton collisions at a centre-of-mass energy of s = 13 $$ \sqrt{s}=13 $$ TeV. The data set corresponds to an integrated luminosity of 3.2 fb−1, recorded in 2015...

This paper presents single lepton and dilepton kinematic distributions measured in dileptonic $$t\bar{t}$$ t t ¯ events produced in 20.2 $$\hbox {fb}^{-1}$$ fb - 1 of $$\sqrt{s}=8$$ s = 8 TeV pp collisions recorded by the ATLAS experiment at the LHC. Both absolute and normalised differential cross-sections are measured, using events with an opposite-charge...

Abstract The cross section of a top-quark pair produced in association with a photon is measured in proton-proton collisions at a centre-of-mass energy of s = 8 $$ \sqrt{s}=8 $$ TeV with 20.2 fb−1 of data collected by the ATLAS detector at the Large Hadron Collider in 2012. The measurement is performed by selecting events that contain a photon with transverse momentum pT > 15 GeV, an...

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